Hello, to activate Parallels Toolbox v3 you can use: - Parallels Desktop subscription license - Parallels Desktop v14 perpetual license (in this case you will have 1-year subscription for Parallels Toolbox). - Parallels Toolbox subscription license If you have Parallels Desktop v13 perpetual license that you can use Parallels Toolbox version 2.6.1 or earlier.
Try to uninstall Parallels Toolbox then download from this link and install. You can activate this version using Parallels Desktop 13 key.